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The old email I used when I first signed up with Firefox I can no longer use due to the company going bankrupt. I am unable to reset my sign in information.

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Due to my old email address being unusable I am unable to create a new account. Can you give me the information to be able to open a new account so I can update firefox on my comupter.

Due to my old email address being unusable I am unable to create a new account. Can you give me the information to be able to open a new account so I can update firefox on my comupter.

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Do you mean your Firefox Account, used for the Sync service?

I don't think you can change anything related to that account if you cannot respond to an email verification.

You can create a new Firefox Account using an email address that you use now. However, I don't think there will be a way to link it to your old information. Hopefully you have a backup of the information from your old Firefox that you can use for manually restoring old data to your new Firefox.

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Note that it is currently possible to add a secondary account for Sync as a safeguard.

You open the Options/Preferences page (about:preferences). Go to the Sync tab and sign in if necessary. Click the "Manage account" button. This should open the Firefox Account settings page.

On this page there is a "Secondary email" button.